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name: contrib/lisp/org-special-blocks.el 	 # note: path name is non-authoritative(*)

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;;; org-special-blocks.el --- Turn blocks into LaTeX envs and HTML divs

;; Copyright (C) 2009 Chris Gray

;; Author: Chris Gray <chrismgray@gmail.com>

;; This file is not currently part of GNU Emacs.

;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2, or (at
;; your option) any later version.

;; This program is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;; General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with this program ; see the file COPYING.  If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:
;;

;; This package generalizes the #+begin_foo and #+end_foo tokens.

;; To use, put the following in your init file:
;;
;; (require 'org-special-blocks)

;; The tokens #+begin_center, #+begin_verse, etc. existed previously.
;; This package generalizes them (at least for the LaTeX and html
;; exporters).  When a #+begin_foo token is encountered by the LaTeX
;; exporter, it is expanded into \begin{foo}.  The text inside the
;; environment is not protected, as text inside environments generally
;; is.  When #+begin_foo is encountered by the html exporter, a div
;; with class foo is inserted into the HTML file.  It is up to the
;; user to add this class to his or her stylesheet if this div is to
;; mean anything.

(defvar org-special-blocks-ignore-regexp "^\\(LaTeX\\|HTML\\)$"
  "A regexp indicating the names of blocks that should be ignored
by org-special-blocks.  These blocks will presumably be
interpreted by other mechanisms.")

(defun org-special-blocks-make-special-cookies ()
  "Adds special cookies when #+begin_foo and #+end_foo tokens are
seen.  This is run after a few special cases are taken care of."
  (when (or htmlp latexp)
    (goto-char (point-min))
    (while (re-search-forward "^#\\+\\(begin\\|end\\)_\\(.*\\)$" nil t)
      (unless (save-match-data
		(string-match org-special-blocks-ignore-regexp (match-string 2)))
	(replace-match
	 (if (equal (downcase (match-string 1)) "begin")
	     (concat "ORG-" (match-string 2) "-START")
	   (concat "ORG-" (match-string 2) "-END"))
	 t t)))))

(add-hook 'org-export-preprocess-after-blockquote-hook
	  'org-special-blocks-make-special-cookies)

(defun org-special-blocks-convert-latex-special-cookies ()
  "Converts the special cookies into LaTeX blocks."
  (goto-char (point-min))
  (while (re-search-forward "^ORG-\\(.*\\)-\\(START\\|END\\)$" nil t)
    (replace-match
     (if (equal (match-string 2) "START")
	 (concat "\\begin{" (match-string 1) "}")
       (concat "\\end{" (match-string 1) "}"))
     t t)))

(add-hook 'org-export-latex-after-blockquotes-hook
	  'org-special-blocks-convert-latex-special-cookies)

(defun org-special-blocks-convert-html-special-cookies ()
  "Converts the special cookies into div blocks."
  ;; Uses the dynamically-bound variable `line'.
  (when (string-match "^ORG-\\(.*\\)-\\(START\\|END\\)$" line)
;    (org-close-par-maybe)
    (message "%s" (match-string 1))
    (if (equal (match-string 2 line) "START")
	(insert "<div class=\"" (match-string 1 line) "\">\n")
      (insert "</div>\n"))
    (throw 'nextline nil)))

(add-hook 'org-export-html-after-blockquotes-hook
	  'org-special-blocks-convert-html-special-cookies)

(provide 'org-special-blocks)

;;; org-special-blocks.el ends here

debug log:

solving a381920 ...
found a381920 in https://yhetil.org/orgmode/1275479264-19089-1-git-send-email-bernt@norang.ca/
found af50b30 in https://git.savannah.gnu.org/cgit/emacs/org-mode.git
preparing index
index prepared:
100644 af50b3092db088b26b2fcf7f50c65e6d36d23640	contrib/lisp/org-special-blocks.el

applying [1/1] https://yhetil.org/orgmode/1275479264-19089-1-git-send-email-bernt@norang.ca/
diff --git a/contrib/lisp/org-special-blocks.el b/contrib/lisp/org-special-blocks.el
index af50b30..a381920 100644

Checking patch contrib/lisp/org-special-blocks.el...
Applied patch contrib/lisp/org-special-blocks.el cleanly.

index at:
100644 a381920c6c1fc237a03fbaf2b3509aca634d2e38	contrib/lisp/org-special-blocks.el

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